Lifting-jack



2 She etS-.Shee.t 1.

(No Model.)

J. W. HAWKINS.

LIFTING JACK.

Patented Oct. 30, 1883.

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N. PETERS. vhmbmm m. Walhington. n. c.

(N0 Model.) 2 ShetS-Sheet 2 J. W. HAWKINS. LIFTING JACK.

No. 287.539. Patented 001i. 30,1883.

a ur WW '74 iinesss Inventor:

N. PETERS. Milo-Lithograph". Walhinglnn. a c,

UNITED ST T S" PATENT OFFICE.

J. WESLEY HAWKINS, OF GALION, OHIO.

LlFTlNG -JACK.

SPECIFICATION forming part of Letters Patent No. 287,539, dated October30, 1883.

' Application filed September 6, 1883. (No model.)

To all whom it may concern.-

Be it known that I, J. WESLEY HAWKINS, a

v citizen of the United States, residing at the part removed, the restin vertical section;-

- connections; Fig. 16, vertical central section town of Galion, in thecounty of Crawford and State of Ohio, have invented a new and usefulImprovement in Lifting-Jacks,of which the following is a specification.

My invention relates to that class of liftingjacks in which a ratchetlifting-bar is raised vertically by a lifting-pawl and held in place bya retaining-pawl.

The objects of my invention are, first, to

avoid the possibility of accident from'breaking or stripping theratchet-teeth; second,

to cause the ratchet-bar, without strain, to be securely gripped by thelifting. and retaining pawls or clutches third, to prevent frictionbetween thelifting-bar and case by applying the power in a direct linewith the bar; fourth, to provide devices whereby the machine may.

at any point be instantly converted into a lowering-jack; and, fifth, toprovide devices whereby both pawls may be instantly disengaged from theratchet lifting-bar, permitting the latter to be freely raised andlowered.

I attain these objects by the mechanism illustrated in the accompanyingdrawings,

wherein Figure 1 represents a side elevation of the complete machine;Fig. 2, a view of case with Figs. 3 and 4, inside and edge elevations,respectively, of removable plate; Figs. 5, 6, 7, side elevation,vertical section, and rear elevation', respectively,-of the lifting-clutch; Figs. 8, 9, 10, vertical section, and side and rearelevations,respectively, of holding-clutch;

Figs. 11 and 12, front and side elevations, re-

. spectively, of ratchet lifting-bar; Fig. 13, side vertical section ofpart of case containing lifting-bar, lifting and holding clutches,andlifting-lever; Fig. 14, rear elevation of case,with part removed;Fig. 15, rear vertical section of part of case containing lifting andholding clutches, lifting-bar, and raising-lever and ing-bar; andFig.22, thelsame parts arranged to lower load.

The frame A, preferably of cast-iron, has a part, A, removable, topermitof placing and removing the working parts. Upon the 0p posite lower sideis an elongated vertical orifice, Fig. 2, through which projects the toeof the lifting-bar B. Inside the case are cast the lug a, upon whichswings the holding-clutch, a seat, a, in which rests one end of thelower bar, 6, of the lifting device, a pin, f, which enters the slot ofthe tumbler G, and a slot, J, at the back, in which moves the pin of theraising-lever I. In the cap A is a slot, at, through which projects thepin f of the tum=' bler G, and upon the cap is cast a wrist, H, uponwhich swings the reversing-lever E.

The ratchet-lifting bar B fits and slides freely in the case A, the toeat its lower end,

tical opening at the back of the case, and the upper end projects beyondthe top of the case and fits into the head 11, (shown in section in dFig. 2.)

The lifting and holding clutches O D con sist of metallic frames ofrectangular plan, parallel sides, the sides projecting diagonallydownward from back to front, and each is provided on its inner side,adjacent to the ratchetteeth, with similar upwardly-projecting teeth, toengage the ratchet-teeth. These clutches surround the ratchet-bar B, theholding-clutcl1 D being suspended on the lug a and the lifting-clutch 0upon the end of the bard of the lifting device. From one side of each ofthese clutches projects a lug, d 0, respectively, whose Fig. 11,projecting through the elongated verofiice will be hereinafterexplained. This lifting device consists of the lever I, projecting fromwhich is apin that fits in the slot J. On

theupper and lower edges of this bar are semi- V circular bearingsoffset from each other by about the width of the projecting pin. a Ashort bar, 1', with rounded ends, rests at one end in the seat a and atthe other in the bearing in the lower edge of the bar I, while asimilarbar t", rests at one end in the bearing in the upper edge of the barI,and its other rests in a bearing at the back of and sustains the lifting-clutch 0. As the outer end of the lever is depressed the bar t"forms a fulcrum by which the bar 13 is raised, and at the same time thetwo bars 1' t" are thrown into line, thereby securing the combinedeffects of a lever and knee-j oint, and raising the clutch O in a directline, which prevents crowding the ratchet-bar against the sides of thecase.

The reversing-gear consists of the tumbler G and reversing-lever E. Thetumbler is of the form shown in Figs. 18 and 19, the upper end, 71,whereof is a hollow case containing a bolt, h, constantly pressedoutward by a spring. This tumbler rests insideof the case, with the pinf entering the slot and the pin f projecting from the tumbler throughthe slot at in the cap A. the pin H, and its upper end terminates in ayoke, which grasps the pin f, and a springbolt, (see Fig. 16,) whichcontinually presses against the pin. The location of the tumbler ischanged by swinging the lower end of the lever E to the right or left, apin on the lever entering a hole in the case, to hold it in any desiredposition. By throwing the end of the lever to the left the tumbler isplaced in the position indicated by Fig. 20, entirely out of contactwith the clutches, thereby permitting them to act naturally with thelifting-bar to raise the load. \Vhen the end of the lever is thrown tothe extreme right, the tumbler assumes the position indicated in Fig.21, when the spring-bolt h presses against the lug d of the clutch D,and the point r presses against. the lug c of the clutch 0, thusdisengaging both from the ratchet-bar and permitting it to slide freely.

To lower the load, the lower end of the lever E is thrown to the center,when the tumbler assumes the position shown in Fig. 22, and itsoperation is as follows: The clutehG, being held outward by the point9-, does not engage the first teeth of the ratchet, but as it is raisedslides past them. The lug c presses on the point 0 and swings thetumbler on the pin f. A curved opening in the upper edge of the slot a"(see Fig. 3) and the spring-bolt 6 permit the pin f to swing upward. Atthe same time the point r recedes and permits the clutch C to approachthe ratchet-bar and engage its next teeth,while the spring-bolt hispressed against the lug d and forced into its case 71, the clutch Dstill remaining engaged with the ratchet-teeth by friction. of teeth theratchet bar is thereby slightly raised, and, the friction being therebyremoved, the spring-bolt h forces back the The reversing-lever ispivoted on As the clutch G engages the next series separate pawls,engaging several teeth at the same time, and a cramp, which securelyholds without straining the ratchet-bar, the gripbeing increased inproportion to the weight of the load.

I claim as my invention- 1. In a lifting-jack, a lifting device,consisting, essentially, of a lever pivoted to swing vertically on a pinresting in avertical slotin the frame, and two bars, one end of eachresting, respectively, in a seat in the frame and a bearing in thelifting-clutch, and theother ends resting on opposite edges of the leverin notches on opposite sides of a cross-line passing through thepivot-pin, substantially as shown, and for the purpose specified.

2. In a ratchet lifting-jack, a lifting and a retaining clutch, eachconsisting of aframe inclosing the ratchet-bar, having the back andfront walls parallel with said bar, the sides diagonal thereto, thelower wall contiguous to the ratchet-bar teeth, and provided on its i11-ner face with two or more corresponding teeth arranged to engage theratchet teeth, substantially as shown, and for the purpose specified.

3. In a ratchet lifting-jack, a tumbler, such substantially as shown,arranged by means of a lever simultaneously to disengage the lifting andretaining clutches from the ratchet lifting-bar, and simultaneously topermit them to engage it, substantially as shown, and for the purposespecified.

4. I11 a ratchet lifting-jack, in combination with the ratchetlifting-bar, lifting-clutch, and retaining-clutch, a lowering device,such substantially as shown, which, operated by the lifting mechanism,shall disengage the retaining-clutch substantially simultaneously withthe engaging of the lifting-clutch, substantially as shown, and for thepurpose specified.

5. In combination with the case A, the ratchet-bar B, clutches G D,lever I, and bars i 17, all constructed and arranged substantially asshown, and for the purpose specified.

6. In combi nati on with the bar B and clutches O D, the tumbler G andlever E, all constructed and arranged to operate substantially as shown,and for the purpose specified.

7. The herein described lifting-jack, consisting of the case A,ratchet-bar B, clutches G D, lever I, bars 2' z", tumbler G, and leverE, all constructed and arranged substantially as shown, and for thepurpose specified.

In testimony that I claim the foregoing I have hereunto set my hand this11th day of August, A. D. 1883.

J. IVESLEY HAlVKINS.

\Vitnesses:

C. P. HUMPHREY, DAYTON A. DOYLE.

